CDN latency test
Find out how quickly your connection reaches the CDN and edge networks our test uses, and whether your provider routes you to them as well as it does for other people.
Free. Runs in your browser with real HTTPS requests. Nothing to install.
Why CDN latency is worth testing
A content delivery network keeps copies of content in many places and sends you to one that is close. With a good route that is a few milliseconds away. With a poor one, your traffic can leave your provider, cross a congested link and arrive at a distant location, so the same CDN feels fast for your neighbour and slow for you.
That difference sits in routing and peering, which a speed test in megabits does not show. Latency to the CDN is the quickest way to see it.
What the test does
The test makes small HTTPS requests from your browser to every destination in the CDN category and times the answer, several passes each. Because it uses real requests, the time includes what a visitor to a site on that CDN also waits for: the connection setup and the first response. The requests are made unique so a cache cannot give you a flattering answer.
Each result is compared with the world average for the same destination, so you can tell your own connection from simple distance.
How to read the result
- Low and steady for all CDNs: your provider routes you well and your local network is healthy.
- High for one CDN only: a routing or peering issue between your provider and that network. Try another time of day and note it if you contact your provider.
- High for everything: look at your own network first (Wi-Fi, a busy upload) before blaming the route.
Questions
Does this show where my traffic is served from?
Not directly. It shows how long answers take, which is the result of where you are routed. A high number usually means a longer or more congested route.
Why do results differ between CDNs?
Each CDN has different locations and different agreements with providers. The same line can reach one very well and another less well.
Can I test my own site behind a CDN?
Yes. Add its address as your own destination. It is measured in your browser only and does not enter the world comparison.